Trying to install multiple gems on cygwin
, I keep getting this error: /usr/share/ruby/2.2.0/mkmf.rb:456:in try_do': The compiler failed to generate an executable file. (RuntimeError)
This error is part of the full error message below:
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
/usr/bin/ruby.exe -r ./siteconf20150603-27012-w371hi.rb extconf.rb
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.
Provided configuration options:
--with-opt-dir
[...truncated...]
--without-pkg-config
/usr/share/ruby/2.2.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /usr/share/ruby/2.2.0/mkmf.rb:541:in `try_link0'
from /usr/share/ruby/2.2.0/mkmf.rb:556:in `try_link'
from /usr/share/ruby/2.2.0/mkmf.rb:637:in `try_ldflags'
from /usr/share/ruby/2.2.0/mkmf.rb:1780:in `pkg_config'
from extconf.rb:15:in `<main>'
extconf failed, exit code 1
Gem files will remain installed in /cygdrive/d/d/.gem/ruby/gems/ffi-1.9.8 for inspection.
Results logged to /cygdrive/d/d/.gem/ruby/extensions/x86_64-cygwin/ffi-1.9.8/gem_make.out
I tried all things I could find on google, out of which some do actually work including:
- Installing the cygwin package corresponding to the gem through cygwin setup
- Installing more cygwin packages, depending on the failing gem
But for this very specific example, I could not find what was missing…
Best Answer
The solution for this error was (and is for all such errors) to have a look at the
mkmf.log
file (for me,/cygdrive/d/d/Documents/.gem/ruby/extensions/x86_64-cygwin/ffi-1.9.8/mkmf.log
) and see which libraries are missing.In my case,
-lcrypt
and-lgmp
were failing, so I had to "cygwin-setup"libcrypt-devel
andlibgmp-devel
.